This is the 14430th most frequent Russian word.
отцов
"Отцов" means "of fathers" or "fathers'."
The word 'отцов' is in genitive plural form, used to describe 'of fathers' when discussing their deeds.
Я читал книгу о подвигах наших отцов.
I read a book about the exploits of our fathers.
'Отцов' again features in the genitive plural, showing possession of wisdom by fathers.
Мудрость отцов передаётся из поколения в поколение.
The wisdom of fathers is passed down from generation to generation.
Here, 'отцам' is in dative plural form but closely mirrors its genitive counterpart in its phonetic appearance.